Granted Patent
Utility
US 4,265,306 · App. 06/127,952
Latch for well tools
Inventor:
Gregg W. Stout
Patented Case
View Patent ↗
Granted: May 5, 1981
Filed: Mar 7, 1980
Inventor
Gregg W. Stout
Assignee (at issue)
Otis Engineering Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.